Articulate Rise Lesson Icons

Hi Guys
I took a screen shot of a Rise course I saw (see attachment), because I liked the icons next to the lesson title.

I have had a play in Rise to try and replicate, e.g. and a process only block to a lesson, and a video only block to another lesson. However my icons are always the three line lesson icon. 

I also tried changing themes. Does anyone know how this is done?

Cheers

Audrey